Title page for ETD etd-01052002-144152

Effects of a dietary milk or carbohydrate supplement with resistance training on body composition, muscle strength and anabolic hormones in untrained men.

Degree

Master of Science

Department

Human Nutrition, Foods, and Exercise

Advisory Committee

Advisor Name

Title

Rankin, Janet L. Walberg

Committee Chair

Gwazdauskas, Francis C.

Committee Member

Nickols-Richardson, Sharon M.

Committee Member

Keywords

IGF-1

insulin

testosterone

periodized resistance training

carbohydrate

Date of Defense

2001-12-10

Availability

unrestricted

Abstract

Twenty untrained men (18-25 y) were assigned to consume either a milk supplement (MILK) or a carbohydrate-electrolyte supplement (CHO) immediately following each resistance workout during a 10 wk resistance training program. Subjects trained 3 d/wk beginning with an intensity of 55% 1-RM and progressing to 97% 1-RM by wk 10. Muscle strength (1-RM), body composition (DEXA) and resting, fasted serum concentrations of total and free testosterone and IGF-1 were measured pre- and post-training. CHO tended to reduce, while MILK increased body weight (P = 0.10). All subjects significantly reduced percent body fat (1.1%) and significantly increased lean body mass (1.21 kg) as a result of the resistance training with no significant differences between treatments. However, MILK tended to increase lean body mass (P = 0.1) more than CHO (1.6 and 0.8 kg, respectively). About 39% of lean mass gain for all subjects was in the leg region, while the arms accounted for about 28% of lean gain. Resistance training also caused a similar significant 44% increase in muscle strength for the seven exercises combined for both groups. Resting total and free testosterone concentrations significantly decreased from baseline values in both groups of subjects (16.7% and 11%, respectively), while resting insulin concentrations significantly increased in all subjects (P<0.01). There were no significant changes in resting, fasted IGF-1 concentrations. In summary, dietary supplementation with a MILK or CHO beverage immediately following resistance exercise resulted in similar changes in muscle strength and hormone concentrations following a 10 wk periodized resistance training program. MILK tended to increase body weight and lean body mass more so than CHO.